Suppose the ends of a 30-m long steel beam are rigidly clamped at 0°C to prevent expansion. The beam has a cross-sectional area of 30 cm2 . What force against the clamps does the beam exert when it is heated to 40°C? (aSteel = 1.1 × 10^-5/°C, Ysteel = 20 × 10^10 N/m2)
2.6 × 10^5 N
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Figure 2-70 shows a section of a large surface plate used for precision measurements. A person touches the surface and thereby induces heat transfer through the plate. Neglecting radiation involved, write the node equations for nodes 1, 5, and 12.
Physical Pendulum: A thin hoop is supported in a vertical plane by a nail. What should the radius of the hoop be in order for it to have a period of oscillation of 1.00 s? The moment of inertia of a hoop of mass M and radius R about a point on its rim is 2MR2.
A. 0.0154 m B. 0.0621 m C. 0.124 m D. 0.1876 m E. 0.248 m
Power: The circuit power factor of an RC circuit is 0.620. The rms value of the ac voltage applied to this signal is 120 V and the impedance is 200 ?. What is the average power of this circuit?
A. 44.6 W B. 89.2 W C. 60.0 W D. 0.620 W E. 124 W
If a galaxy is moving away from us at 1.0% of the speed of light, how far away is it from us?
A) 14 ly B) 140 ly C) 140 thousand ly D) 140 million ly E) 140 billion ly